* {
    margin: 0;
    padding: 0;
    /*color: #fff;*/
    list-style: none;
    text-align: center;
    text-decoration: none;
}

html {
    scroll-behavior: smooth;
}

header {
    transition: all 0.5s ease;
    min-width: 769px;
    width: 100%;
    height: 448px;
    background-size: 100%;
    background-position: top;
    background-repeat: no-repeat;
    position: relative;
    overflow: hidden;

    .header-nav {
        /*max-width: 1310px;*/
        width: 100%;
        margin: 50px auto 0;
        height: 66px;
        position: relative;
        /*top: 11%;*/
        /*background-color: #cccccc;*/

        .header-nav-box {
            max-width: 1310px;
            margin: 0 auto;
            height: 66px;
            display: flex;
            flex-wrap: nowrap;
            /*margin-left: -80px;*/
            justify-content: space-around;

            .logo {
                display: inline-block;

                img {
                    width: 208px;
                    height: 61px;
                }
            }

            nav {
                /*background-color: yellow;*/
                @media screen and (min-width: 1193px) {
                    margin-left: 20px;
                    transition: all 0.5s ease;
                }

                @media (min-width: 941px) and (max-width: 1192px) {
                    margin-left: 10px;
                    transition: all 0.5s ease;
                }
                @media (min-width: 769px) and (max-width: 940px) {
                    margin-left: 5px;
                    transition: all 0.5s ease;
                }

                ul {
                    display: flex;
                    flex-wrap: nowrap;
                    /*overflow: hidden;*/

                    li {
                        height: 66px;
                        /*display: inline-block;*/
                        box-sizing: border-box;
                        transition: all 0.3s ease;
                        @media screen and (min-width: 1193px) {
                            width: 120px;
                            padding: 23px 10px;
                            font-size: 16px;
                            transition: all 0.5s ease;
                        }

                        @media (min-width: 941px) and (max-width: 1192px) {
                            width: 90px;
                            padding: 23px 8px;
                            font-size: 14px;
                            transition: all 0.5s ease;
                        }
                        @media (min-width: 769px) and (max-width: 940px) {
                            width: 65px;
                            padding: 23px 0;
                            font-size: 14px;
                            transition: all 0.5s ease;
                        }


                        a {
                            color: #fff;
                            font-weight: 700;
                            font-family: 黑体, serif;
                            text-decoration: none;
                        }
                    }

                    /*li:hover {*/
                    /*    transition: all 0.3s ease;*/
                    /*    border-bottom: 4px solid #00CCFF;*/
                    /*}*/
                }
            }

            .menu {
                display: none;
            }

            .indicator {
                position: absolute;
                bottom: 0;
                height: 4px; /* 指示器的高度 */
                background-color: #00CCFF; /* 指示器的颜色 */
                transition: all 0.3s ease; /* 平滑过渡效果 */
                /*width: 120px; !* 指示器的初始宽度，与导航项宽度一致 *!*/
                /*left: 0; !* 指示器的初始位置，与第一个导航项对齐 *!*/
                display: none;
                @media screen and (min-width: 1193px) {
                    width: 120px;
                    transition: all 0.5s ease;
                }

                @media (min-width: 941px) and (max-width: 1192px) {
                    width: 90px;
                    transition: all 0.5s ease;
                }
                @media (min-width: 769px) and (max-width: 940px) {
                    width: 65px;
                    transition: all 0.5s ease;
                }
            }
        }

        .hideMenu {
            width: 100%;
            height: 188px;
            background-color: rgba(0, 0, 0, 0.75);
            box-sizing: border-box;
            padding: 20px;
            display: none;


            ul {
                margin-right: -150px;

                li {
                    box-sizing: border-box;
                    width: 50px;
                    margin: 0 auto;

                    a {
                        color: #fff;
                        font-size: 6px;
                        display: inline-block;
                        width: 100%;
                        text-align: left;
                    }

                    a:hover {
                        color: #00afc7;
                    }
                }
            }
        }
    }

    .header-nav.on {
        background-color: rgba(0, 0, 0, 0.75);
        position: fixed;
        top: 0;
        z-index: 999999;
        margin: 0 auto;
    }

    .tit {
        position: absolute;
        left: 50%;
        bottom: 14%;
        transform: translate(-50%, 0);
        text-align: center;
        color: #fff;

        .tit-up {
            font-size: 34px;
            font-weight: bold;
        }


        .tit-down {
        }
    }
}

.goTop {
    width: 35px;
    height: 35px;
    display: none;
    border-radius: 5px;
    cursor: pointer;
    transition: transform 0.5s ease;
    background-color: rgba(0, 0, 0, 0.8);
    position: fixed;
    right: 40px;
    bottom: 100px;
    z-index: 999;

    a {
        img {
            vertical-align: middle;
        }
    }
}

.goTop.on {
    display: block;
    transform: rotate(360deg);
}